Accelerator observations
#1
07-26-2008, 08:18 PM
Join Date: Oct 2005
Location: Huntsville, AL
Posts: 5,613
Accelerator observations
An interesting, NHW11 accelerator encoder was returned for re-work:
http://hiwaay.net/~bzwilson/prius/pri_acc_200.jpg
http://hiwaay.net/~bzwilson/prius/pri_acc_210.jpg
http://hiwaay.net/~bzwilson/prius/pri_acc_220.jpg
http://hiwaay.net/~bzwilson/prius/pri_acc_230.jpg
http://hiwaay.net/~bzwilson/prius/pri_acc_240.jpg
You will notice the lever arm of the resistor assembly is bent so at maximum accelerator deflection, the angle of the nylon bushing can easily 'jam' in the slider. I noticed the 'sticky' position while testing the accelerator after cleaning the slider contacts. Given a little dust between the nylon bushing and the metal slider or paint or other sticky debris, the accelerator could stick in the fully depressed position. This could lead to an exciting driving experience.
The lever arm looked to be substantially strong piece with re-enforcing bend through the center but I was surprised at how easy it was to straighten it. Regardless, another non-linearity in the resistance range disappeared once the arm looked more like 90 degrees.
I'll put this repaired accelerator in my car in the morning and ship the other one out. But now I see how a bent lever arm could lead to a stuck accelerator. I understand the NHW20 uses a similar mechanical configuration.
Bob Wilson
http://hiwaay.net/~bzwilson/prius/pri_acc_200.jpg
http://hiwaay.net/~bzwilson/prius/pri_acc_210.jpg
http://hiwaay.net/~bzwilson/prius/pri_acc_220.jpg
http://hiwaay.net/~bzwilson/prius/pri_acc_230.jpg
http://hiwaay.net/~bzwilson/prius/pri_acc_240.jpg
You will notice the lever arm of the resistor assembly is bent so at maximum accelerator deflection, the angle of the nylon bushing can easily 'jam' in the slider. I noticed the 'sticky' position while testing the accelerator after cleaning the slider contacts. Given a little dust between the nylon bushing and the metal slider or paint or other sticky debris, the accelerator could stick in the fully depressed position. This could lead to an exciting driving experience.
The lever arm looked to be substantially strong piece with re-enforcing bend through the center but I was surprised at how easy it was to straighten it. Regardless, another non-linearity in the resistance range disappeared once the arm looked more like 90 degrees.
I'll put this repaired accelerator in my car in the morning and ship the other one out. But now I see how a bent lever arm could lead to a stuck accelerator. I understand the NHW20 uses a similar mechanical configuration.
Bob Wilson
Last edited by bwilson4web; 07-26-2008 at 08:27 PM.
#2
09-03-2008, 09:06 PM
Re: Accelerator observations
An interesting, NHW11 accelerator encoder was returned for re-work:
http://hiwaay.net/~bzwilson/prius/pri_acc_200.jpg
http://hiwaay.net/~bzwilson/prius/pri_acc_210.jpg
http://hiwaay.net/~bzwilson/prius/pri_acc_220.jpg
http://hiwaay.net/~bzwilson/prius/pri_acc_230.jpg
http://hiwaay.net/~bzwilson/prius/pri_acc_240.jpg
You will notice the lever arm of the resistor assembly is bent so at maximum accelerator deflection, the angle of the nylon bushing can easily 'jam' in the slider. I noticed the 'sticky' position while testing the accelerator after cleaning the slider contacts. Given a little dust between the nylon bushing and the metal slider or paint or other sticky debris, the accelerator could stick in the fully depressed position. This could lead to an exciting driving experience.
The lever arm looked to be substantially strong piece with re-enforcing bend through the center but I was surprised at how easy it was to straighten it. Regardless, another non-linearity in the resistance range disappeared once the arm looked more like 90 degrees.
I'll put this repaired accelerator in my car in the morning and ship the other one out. But now I see how a bent lever arm could lead to a stuck accelerator. I understand the NHW20 uses a similar mechanical configuration.
Bob Wilson
http://hiwaay.net/~bzwilson/prius/pri_acc_200.jpg
http://hiwaay.net/~bzwilson/prius/pri_acc_210.jpg
http://hiwaay.net/~bzwilson/prius/pri_acc_220.jpg
http://hiwaay.net/~bzwilson/prius/pri_acc_230.jpg
http://hiwaay.net/~bzwilson/prius/pri_acc_240.jpg
You will notice the lever arm of the resistor assembly is bent so at maximum accelerator deflection, the angle of the nylon bushing can easily 'jam' in the slider. I noticed the 'sticky' position while testing the accelerator after cleaning the slider contacts. Given a little dust between the nylon bushing and the metal slider or paint or other sticky debris, the accelerator could stick in the fully depressed position. This could lead to an exciting driving experience.
The lever arm looked to be substantially strong piece with re-enforcing bend through the center but I was surprised at how easy it was to straighten it. Regardless, another non-linearity in the resistance range disappeared once the arm looked more like 90 degrees.
I'll put this repaired accelerator in my car in the morning and ship the other one out. But now I see how a bent lever arm could lead to a stuck accelerator. I understand the NHW20 uses a similar mechanical configuration.
Bob Wilson
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